Esterification reactor and production method of dimethyl maleate

Abstract

The invention relates to an esterification reactor and a production method of dimethyl maleate. The esterification reactor is suitable for esterification reactions of carboxylic acids and alcohols. The reactor is composed of a plurality of tower plates; each tower plate is provided with a downtake pipe and an ascension pipe, wherein the ascension pipe is connected with a gill type gas distributor; each tower plate reserves a certain liquid level liquid, wherein the liquid contains a solid catalyst; and the liquid phase is a component containing a carboxylic acid, flows downward from an esterification tower plate to the following tower plate in the reactor, and reacts with rising alcohol steam countercurrent. The esterification reactor has the advantages of adequate contact of three phases (gas, liquid and solid), high reaction efficiency, high volume utilization rate of the reactor, and the like; and is suitable for various esterification reaction processes.

Description

technical field [0001] The invention relates to a reactor and a method for producing dimethyl maleate, in particular to a reactor suitable for the esterification reaction of carboxylic acids and alcohols. Background technique [0002] The esterification reaction is a process in which a monobasic acid, a dibasic acid or a polybasic acid (acid anhydride under certain conditions) reacts with an alcohol or a phenolic substance to form an ester. The esterification reaction is generally a reversible equilibrium reaction. These alcohols and phenolic substances may be monohydric alcohols, dihydric alcohols or polyhydric alcohols. Taking monoester as an example, the reaction process is as follows: [0003] [0004] R 1 Can be a hydrogen atom or a monovalent organic group, R 2 is a monovalent organic group. When the reactant is an acid anhydride, the reaction is divided into two steps: [0005] [0006] [0007] R 3 is a divalent organic group, R 4 is a monovalent org...

AI Technical Summary

Problems solved by technology

[0012] 3. The organic carboxylate produced in the washing process will aggravate the environmental pollution problem;

The use of homogeneous catalysts for continuous esterification has many disadvantages, usually batch reactions are used, and the product quality is not high

[0014] 5. Another disadvantage of using homogeneous catalysts is that sulfur-containing components are mixed in the ester phase, and sulfur-containing components will seriously affect subsequent process operations

This method has limited effect and cannot make the bed temperature and fluid dynamics uniform, and it is difficult to effectively improve the efficiency of the reactor.

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